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Wireless communication apparatus

Inactive Publication Date: 2005-03-10
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] Accordingly, no outside antenna protruding from a housing of a wireless communication apparatus is required. Furthermore, since the length of a slit which is provided on the housing can be shorter than that of conventional ones, a wireless communication apparatus can further be miniaturized.
[0015] According to the present invention, since a metal housing itself of a wireless communication apparatus is used as a part of a slit antenna, no outside antenna is required, so that a wireless communication apparatus can be miniaturized easily.
[0016] Also, a balun or the like is conventionally necessary for antenna matching; however, according to the present invention, the communication sensitivity can be improved without adding a balun or the like.
[0017] Moreover, since the length of a slit can be shorter than that of conventional slit antennas, a slit antenna further small-sized than the conventional ones can be obtained and therefore can be easily applied to the small-sized apparatus such as a mobile wireless communication apparatus and others. Also, the degree of the freedom in design for the outer appearance can be enhanced.BRIEF DESCRIPTION OF THE DRAWINGS

Problems solved by technology

For performing the wireless communication function, an antenna is indispensable; however, the antenna may greatly lose the sensitivity thereof when located near metals or put into a metal covered housing.
However, placing an antenna outside the housing was not preferable in view of being an obstacle to achieve miniaturization of the apparatus.
Also, when a part of the housing near an antenna is made of a plastic or the like instead of a metal, such problems as decreasing the strength of the housing and decreasing the degree of freedom in design may occur.
However, the above described slit antenna has become an obstacle to the design of a housing due to the length of an antenna that is {fraction (λ / 2 )} and too long.
Therefore, it is difficult to install the slit antenna in wireless communication apparatuses particularly for portable use or of small size such as a mobile telephone unit and PDA, and also it becomes an obstacle to the miniaturization of a housing.
Further, requiring a balun or the like to obtain antenna matching also becomes an obstacle to the miniaturization of a housing.

Method used

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Experimental program
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first embodiment

[0027]FIG. 2 shows an example of structure of an antenna device according to the present invention. As shown in FIG. 2, to obtain the wireless communication function of ISM band (2.4 GHz), a rectangular slit (opening) 1 having the length of 46.9 mm that is equal to ⅜λ is provided in a metal plate 5 on the surface of a metal housing, and a feeder 2 is connected to a feeding point 3 located on the metal portion at the position approximately three-quarters of the long side L of the slit 1. The feeder 2 is connected to a transmitter or a receiver, which is not shown in a drawing and is located inside the housing. As the feeder 2, an unbalanced transmission line may be used, and in this example, a coaxial cable is used. Hereupon, a core wire conductor of a signal line 2a of the coaxial cable is connected to a feeding point 3, and an external sheath conductor of a ground line 2b is connected to a ground point 4 located at the metal portion on the opposite side of the feeding point 3 locat...

second embodiment

[0028]FIG. 3 shows an example of structure of an antenna device according to the present invention. In FIG. 3, a rectangular slit (opening) 1 having the length of 46.9 mm that is equal to ⅜λ is also provided in the metal plate on the surface of the metal housing, and a feeder is connected to a feeding point 3 located on the metal portion at the position approximately three-quarters of the long side of the slit 1. In this example, a feeder is constructed using a microstrip line on a PCB (Printed Circuit Board) 6. The microstrip line is also an unbalanced transmission line, and here a transmission line 2a′ of the microstrip line is connected to the feeding point 3, and a conduction portion 2b′ constituting a ground plane is connected to a ground point 4.

[0029] Note that the width of the slit 1 explained in the first and second embodiments, namely the width W of slit 1 shown in FIG. 2, can be adjusted in accordance of the band width to be used. The broader the width W becomes, the more...

third embodiment

[0034] Next, an example of structure of an antenna device according to the present invention is shown in FIG. 6. In FIG. 6, a slit 12 is provided in the metal plate on the surface of a metal housing, and a feeder 2 is connected to a feeding point 3 located on the metal portion at the position approximately ¾ of the long side L′ of the slit 12. Further, the opening of the slit 12 is filled with a dielectric material 8 such as plastics or others. Accordingly, as shown in the following Formula 1, by filling the opening of slit 12 with the dielectric material 8, the length L′ of the slit can be made short depending upon the value of an effective relative dielectric coefficient of this slit 12. [Formula 1]L′=3⁢λ8⁢ɛ⁢ ⁢eff

[0035] For example, when the slit 12 is filled with ABS resin (Acrylonitrile Butadiene styrene resin) and in the case where an effective dielectric coefficient of the slit portion is εeff=4, the length L′ of the slit 12 becomes ½ of the length 46.9 mm of the slit explaine...

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Abstract

A wireless communication apparatus having a metal housing is provided, in which an outside antenna is not required and a small antenna the sensitivity of which does not decrease is included. A slit 1 is provided on a metal housing 5 of a wireless communication apparatus and a feeder 2 is connected to a position approximately three-quarters of the long side of the slit 1 to be used as a ⅜λ slit antenna.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a wireless communication apparatus including a slit antenna that is used for wireless communication. [0003] 2. Description of the Related Art [0004] A wireless communication apparatuses such as a mobile telephone; a personal computer incorporating a mobile telephone, a Bluetooth®, a wireless LAN, a UWB (Ultra Wide Band) and others for performing the function of wireless communication; PDA (Personal Digital Assistance); a digital still camera; a camcorder; consumer electric appliances and the like have been known. In those wireless communication apparatuses, such as magnesium (Mg), aluminum (Al) or other metals are used for a part or the whole of a housing in order to improve the strength thereof and to make outer appearance excellent in design. For performing the wireless communication function, an antenna is indispensable; however, the antenna may greatly lose the sensitivity thereo...

Claims

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Application Information

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IPC IPC(8): H01Q1/24H01Q13/10H01Q13/16H04B1/38
CPCH01Q13/10H01Q1/243H04B1/38H01Q1/24
Inventor TSUKAMOTO, SOTARO
Owner SONY CORP
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